package grub-pc 2.02-2ubuntu8.10 [origin: Ubuntu] failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 2

出现错误

ProblemType: Package
DistroRelease: Ubuntu Kylin 18.04
Package: grub-pc 2.02-2ubuntu8.10 [origin: Ubuntu]
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Thu Jan 31 16:04:31 2019
ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 2
InstallationDate: Installed on 2018-04-09 (297 days ago)
InstallationMedia: Ubuntu-Kylin 17.10 "Artful Aardvark" - Release amd64 (20180106)
InvalidGrubScript: /etc/default/grub
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-34-generic root=/dev/mapper/ubuntu--kylin--vg-root ro locale=zh_CN quiet splash vt.handoff=1
Python3Details: /usr/bin/python3.6, Python 3.6.7, unpackaged
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, unpackaged
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2.1
 apt 1.6.8
SourcePackage: grub2
Title: package grub-pc 2.02-2ubuntu8.10 [origin: Ubuntu] failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 2
UpgradeStatus: Upgraded to bionic on 2018-05-31 (244 days ago)